Treadmills desks can be built at home as long as you have a treadmill. Sharyn Morrow/Wikimedia Commons via Flickr hide caption

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Are BPA-free bottles really safer than the ones that are chock-full of bisphenol A? Good luck trying to find out. David McNew/Getty hide caption

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Orthopedist Popi Gianakouras helps 45-year-old Bob Rothaker with physical therapy to treat his sore shoulder. Richard Knox/NPR hide caption

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Most Americans spend the majority of their waking hours sitting still in front of a computer or television. hide caption

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